Former Owner
- John Henry Ellis1
- John Morgan1
- John Walker1
- Joseph E. Widener1
- Judith Lady Montefiore College1
- Julia Burgess1
- Julie Florence de Cossette1
- Lancino Curti1
- Leonardus Martinotius1
- Leonhardus Cuntius1
- Lodovicus Saltariellus1
- Louis Bourguet1
- Louis XII of France1
- Luigi Arrigoni1
- Luigi Celotti1
- Luigi Cora1
- Mannheimer Hofbibliothek1
- Marcantonio Contarini1
- Marchese Linterno1
- Martin Breslauer1